add date and time to an AVI/VOB file

this is driving me nuts! I'm trying to use avisynth to solve this problem......

I've captured a video file from an old VHS camcorder and converted it to AVI. there is no time or date.

I can capture a file with black background and the time and date present, from the old camera and turn it into AVI. Could I overlay this onto my video using avisynth? I can't work out how to make black transparent and craete the effect?

Any suggestions on a script that will allow me to overlay the two files to superimpose the date/time?

or

There's no stream for date/time so DVinfo won't work

Any suggestions for a script that will create a date and time stamp from the system clock, or let me specify the start/end times? SMTP won't show the date I think.